Bipolar disorder is a difficult illness to deal with for everyone involved. If the person with bipolar disorder is not receiving treatment or is not compliant with the treatment then life will become a roller coaster ride of epic proportions. Chaos will ensue until the individual decides to get treatment. Your situation is not unique. This is a common scenario with someone who is manic. Often they will engage in more than one relationship. Proper treatment can help this man make better choices. You need to decide at what point you have had enough and how much you can give to the relationship. Self preservation needs to come into play at some point. You need to weigh out the pros and cons. If you decide that he is worth fighting for you should educate yourself about the disorder. This will help you to understand him and what he is going through. If he is unwilling to get treatment or comply with the treatment you may really want to evaluate if this is a good situation to be in. You may want to cut your losses now and move on.